Micrometer-calipers.



PATENTED MAY15, 1906.

F. G. MARBAGH. MIUROMETER GALIPERS.

APPLICATION FILED JA1I.16, 1905.

FRANK Ur. MARBAOH, Oh MEDlNA, (ll-lit) inionoiuieren ontieenol To allwhom, it um concern Be it known that I, FRANK G. MAEBACH, of l vledina,in. the county of Medina, and in the Eltate' of Ohio, have invented acertain new and useful improvement in lvlicrometer-CalL- pers and l dohereby declare that the follow-- pan K l awlngo, in. which Figure l. ise side elevation of a caliper or cnihodying my invention, end Fig. 2 ise cross-section on the line 2 2 of lilig. l.

The object of my invention is to provide a constructitui, of micrometercaliper or gage which may he used for quick and accurate reading, and tothis end my invention consists in1 the celipcr or constructed suhst inym ierei n alto specified and claimed. in the en'il'iodin'lent of In yinvention Which l heme selected for illustration the caliper hes athshaperl frame A, one arm of which carries the enr l B and the otherarm of which sup ports the measuring rod or post 0, Which is round incross-section and isslidahly mounted in an opening .in its supportingarm, which of course clincs with the onvil B. Extending at right anglesfrom the hub or boss of the arm that supports the measuring rod or postis e lug; D, which has a tapering cavity that extends deep enough to expose the measuring-- post and graduations c thereon, and in the outerend of he cavity of said boss is mount-- ed a magnifying gloss or lensit, so that looking tlu'i'iugh thi glass the graduations c on thenieasiwing-post will. he magnified so as to coolly and quicl zl y read.A lighi -hole of is provided in the lug l) below the The log D has onits inner surface an index or reediog line cl for the gradiilations c.The graduotions 1; may he hundredths of an inch, and it will thereforehe seen that by the use of the magnifyinu eless very line graduationsmay he employed, which will enable exceedinglv close incssiu'emcnts tobe accurately Ina' c. lily mounting the glass upon the stationary frameit will he soon that the p0siti on of the glass with reference to the readi ngpoint not changed,so that the operation oi Elpocification ofLetters Patent. Application filed January 16, 1905. Serial lie. 241.270.

reading the indication may he most readily ija'teute i Eli lay 15, -398.

and quickly done, and there is no projection or protrusionol theglass-support to an. extent to make it awkward to handle the instrumentor likely that the glass will he struck against objects in the use ofthe instrument.

I Besides the line measurements which. are possible because of the useof the iuegniilying-glass, I provide for using the instrument forcoarser niel'isiuen'lents, and for this pun pose I lace upon themeasuring rod or post C a see c c of coarser grzuluatjons-say sixty- 6efourths of an inch--the index or reedingpoint for which is at the end cla tubular extension (1' of the frame huh or boss which supe ports thelneasuri ngpost. To hold the measuring-postin anyposition, a llOlClll'l;or claiup- 6 5 ing means is prijividecl, which, as s iowu, cousts of athumb ,nut i having a tapering here which engages thread on the exterioroi the tubular extension 02, which. latter is split longitudinally, sothat the nut may con'iprees it and bind it against the1H0fifsLll'lllg-pt'lst when the nut is turned in one direction. On. theouter end of the me'asuri g-post is a knurled head i), lo y which thepost may he moved lore gituclinally in taking'a incasurei'nent and by 7which it may be rotated to bring one or the other of the scales inposition for reading.

lit will be seen that by my invention It pr0- vicle a caliper by meansof which measurements can be most quickly made and 1nens- 0 urenients ofthe finest description. made with accuracy.

It is to he understood that though the construction which I haveillustrated and de scribed is a very satisfactory one in its cle- 5tails neverthel was I do not limit myschl to such precise construction.

Having thus described my invention, what I claim l. A caliper or gage,con'i 'iesing a l re-me having an arm with an opening, a measuring posthaving grauluetions on its surl'acc puss ing through said opening, saidarm having a cavity Wholly within the limits thereof that intersects theopening through wllich the measuring-post passes, through which cavitygraductions of the measuring-post are visilole and a mag-oitying-glassin. said cavity; and.

and having a 1i ght-g.d.n1itt ng opening, and a mountsd 11! said cavity.

ARIBACH.

FRANK SPELLMAN, 1 'r E001".

